3. Milling is another basic machining
process by which surface is generated
progressively by the removal of chips from
a work piece as it is fed against a rotating
cutter.
Milling operations can be classified into
two broad categories
1. Peripheral Milling
2. Face Milling
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5. Operation performed by milling cutter to produce a
machined surface parallel to axis of rotation of cutter
Cutting force is not uniform throughout the length of
the cut by each tooth
Quality of surface generated and shape of the chip
formed depends upon the rotation of cutter relative to
direction of feed movement
It can be either UP milling or DOWN milling
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6. Also called conventional milling,
- Wheel rotation opposite of the feed
- The chip formed by each cutter tooth starts out very thin and
increases its thickness
- The length of the chip is relatively longer
- Tool life is relatively shorter
- Need more clamping force to hold the work part still.
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7. Also called climb milling,
- Wheel rotation is parallel to the feed
- The chip formed by each cutter tooth starts out thick and leaves
out thin
- The length of the chip is relatively short
- Tool life is relatively longer
- Need less clamping force to hold the work part still.
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9. The generated surface is at right angles to the cutter
axis
It is the combined result of actions of the portions of
the teeth located on both periphery and the
face of the cutter
Most of the cutting is done by the peripheral portions
of the teeth, with the face portions provides the
surface finish.
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11. The milling machine supplies an accurate rotating
spindle for the cutter and a table (vise) to fix and
position the work part.
Types of Milling Machines are -:
Column & Knee Type
Fixed Bed Type
Planer Type
Special Type
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12. 12
• General purpose
• Column, spindle, cutter, table,
knee, base are the common
parts of the vertical and
horizontal milling machines
• The milling machines having
only the three mutually
perpendicular table motions
(x-y-z axes) are called plain
column and knee type
• Vertical type is especially well
suited for face and end milling
operations
13. 13
• In horizontal, arbor supports
the cutter and an over arm
supports arbor
• The vertical column houses
the electrical, main drive,
spindles etc mounted on a
heavy base
17. Operation of
production of
plane flat surface
parallel to axis of
rotation of plain
milling cutter
Cutter width extends
beyond the work piece
on both sides
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20. Combination of
peripheral and face
milling
Cutter has teeth
both on end face
and periphery
Vertical milling
machine is most
suitable for end
milling operation
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21. Operation of
production of flat
vertical surface on
side of work piece
by using side
milling cutter
Depth of cut
adjusted by
rotating vertical
feed screw of the
table
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22. Operation of
production of flat
vertical surfaces
on both side of the
workpiece by
using two side
milling cutters
mounted on the
same arbor
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24. Operation of milling
several surfaces of
the workpiece
simultaneously by
feeding the table
against a number
of cutters having
same or different
diameters
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25. It is the operation
of production of
irregular contours
using form cutters
The contours
maybe convex,
concave or any
other shape
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26. It is the
operation of
reproduction of
an outline of a
template or
complex shape
of a master die
on a workpiece
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27. Operation of
production of
keys, grooves and
slots of varying
shapes and size
by using a plane
milling cutter, a
metal slitting saw,
an end mill or by
side milling cutter
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28. Operation of
production of
threads by using a
single or multiple
thread milling cutter.
It is performed in
special thread
milling machine to
produce accurate
threads
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